1. Active Lecture Questions Microbial Diseases of the Digestive System
Chapter 25
Microbial Diseases of the Digestive System
Copyright © 2010 Pearson Education, Inc.

2. All of the following can be transmitted by recreational (i. e
All of the following can be transmitted by recreational (i.e., swimming) water sources except
a. amoebic dysentery.
b. cholera.
c. giardiasis.
d. hepatitis B.
e. salmonellosis.
Answer: d

3. A patient with nausea, vomiting, and diarrhea within 5 hours after eating most likely has
a. shigellosis.
b. cholera.
c. E. coli gastroenteritis.
d. salmonellosis.
e. staphylococcal
Answer: e

4. Isolation of E. coli from a stool sample is diagnostic proof that the patient has
a. cholera.
b. E. coli gastroenteritis.
c. salmonellosis.
d. typhoid fever.
e. none of the above
Answer: e

5. Gastric ulcers are caused by
a. stomach acid.
b. Helicobacter pylori.
c. spicy food.
d. acidic food.
e. stress.
Answer: c

6. Microscopic examination of a patient’s fecal culture shows comma-shaped bacteria. These bacteria require 2–4% NaCl to grow. The bacteria probably belong to the genus
a. Campylobacter.
b. Escherichia.
c. Salmonella.
d. Shigella.
e. Vibrio.
Answer: e

7. A cholera epidemic in Peru had all of the following characteristics
A cholera epidemic in Peru had all of the following characteristics. Which one led to the others?
a. eating raw fish
b. sewage contamination of water
c. catching fish in contaminated water
d. Vibrio in fish intestine
e. including fish intestines with edibles
Answer: b

8. Identification of this is based on the observation of oocysts in feces.
a. Campylobacter
b. Cryptosporidium
c. Escherichia
d. Salmonella
e. Trichinella
Answer: b

9. Swelling around the eyes is a characteristic disease symptom caused by what microorganism
a. Campylobacter
b. Cryptosporidium
c. Escherichia
d. Salmonella
e. Trichinella
Answer: e

10. Microscopic observation of a stool sample reveals gram-negative helical cells. This is a disease symptom of what microorganism?
a. Campylobacter
b. Cryptosporidium
c. Escherichia
d. Salmonella
e. Trichinella
Answer: a

11. What microbe is frequently transmitted to humans via raw eggs.
a. Campylobacter
b. Cryptosporidium
c. Escherichia
d. Salmonella
e. Trichinella
Answer: d

12. a. Dental caries b. Dental plaque c. Dentin d. Dextran
The accumulation of microorganisms and their products on the teeth is called
a. Dental caries
b. Dental plaque
c. Dentin
d. Dextran
Answer: b

13. The population of microorganisms in the large intestine is composed mostly of
a. Aerobes and anaerobes
b. Anaerobes and facultative anaerobes
c. Aerobes and facultative aerobes
d. Obligate anaerobes
Answer: b

14. Approximately how many species of bacteria have been isolated from the oral cavity?
Answer: d

15. Severe diarrhea accompanied by blood or mucus is called
a. Food poisoning
b. Intoxication
c. Gastroenteritis
d. Dysentery
Answer: d

16. Bacillary dysentery is caused by
a. Staphylococcus
b. Shigella
c. Salmonella
d. Clostridium
Answer: b

17. In Bangladesh, where cholera is common, deaths are considered “unusual” because of
a. Effective sanitation methods
b. Antibiotics
c. Rehydration therapy
d. Vaccination
Answer: c

18. In 20–40% of men past puberty, the mumps virus can cause
a. Orchitis
b. Liver damage
c. Fever
d. Death
Answer: a

19. Which hepatitis virus infection are health care workers at a higher risk of contracting than the general population?
a. HAV
b. HBV
c. HEV
d. HDV
Answer: b

20. a. Antitoxins b. Oral rehydration c. Antibiotics d. Antiviral agents
The treatment for viral gastroenteritis, such as an infection of norovirus, is
a. Antitoxins
b. Oral rehydration
c. Antibiotics
d. Antiviral agents
Answer: b

21. a. An enzyme b. An exotoxin c. An endotoxin d. A mycotoxin
When multiple patients have similar clinical signs and symptoms, which of the following is most likely involved?
a. An enzyme
b. An exotoxin
c. An endotoxin
d. A mycotoxin
Answer: d

22. It is quite common to ingest aflatoxins when one eats
a. Bread
b. Meat
c. Peanuts
d. Cheese
Answer: c

23. What organism produces cysts that contaminate food and water and cause dysentery?
a. Cyclospora cayetanensis
b. Giardia lamblia
c. Entamoeba histolytica
d. Aspergillus flavus
Answer: c

24. How many stages are there in the life of typical tapeworms?
a. Two
b. Three
c. Four
d. Five
Answer: b

25. The portal of entry for the larvae of hookworms is the
a. Skin
b. Mouth
c. Blood
d. Lymph
Answer: a

26. a. Hookworms b. Ascariasis c. Trichinellosis d. Pinworms
In what disease do the larvae not only cause digestive problems but also may cause pulmonary symptoms?
a. Hookworms
b. Ascariasis
c. Trichinellosis
d. Pinworms
Answer: b